28007580 has 48 divisors (see below), whose sum is σ = 78654240. Its totient is φ = 7446528.

The previous prime is 28007569. The next prime is 28007597. The reversal of 28007580 is 8570082.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34216 + ... + 35024.

It is an arithmetic number, because the mean of its divisors is an integer number (1638630).

Almost surely, 2^28007580 is an apocalyptic number.

28007580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28007580 is an abundant number, since it is smaller than the sum of its proper divisors (50646660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28007580 is a wasteful number, since it uses less digits than its factorization.

28007580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398 (or 1396 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 28007580 is about 5292.2188163378. The cubic root of 28007580 is about 303.6862963158.

The spelling of 28007580 in words is "twenty-eight million, seven thousand, five hundred eighty".